The Western Digital Raptor IDE hard drives are probably the fastest IDE drives out there currently, with 10k rpm, 5ms seek speed, and Serial ATA 150 transfer.
Up until now they only shipped in 36GB and 74GB capacities, but WD now also have a 150GB drive… with a transparent window so you can see the platters spinning and the drive head moving. How cool is that. Presumably you’ll need a transparent PC case also, or at least a window…